Polycom DOC2237A Hardware Installation Manual page 113

Each 160-pin connector can be connected to one 160-pin connector located
on the front panel of the MPI box.
Figure 4-21: MPI box front panel
Each of the 160-pin connectors on the MPI box interfaces to four serial ports
found on the back of the MPI box. Therefore, each MPI-8 Network Interface
module can be connected to up to eight ports. Each port has two connectors:
37-pin connector and the 25-pin connector. The 25-pin connector is used to
dial to an endpoint over an ISDN switch. (In leased line connection this port
is not used.) The 37-pin connector connects to the serial cable coming from
the DCE.
Single port
connection
P12
P13
P14
P1 P6 P11
P2 P7 P12
P3 P8 P13
P14
P4 P9 P15
P5
P10 P16
P15
P16
Figure 4-22: MPI box rear panel
MGC Hardware and Installation Manual
160-pin connector
Converts data from four ports
PORTS A
1-4
PORTS B
5-8
160-pin connector
Converts data from four ports
P7
P8
P9
P10
P11
A PORTS
9-12
PORTS
B
13-16
RS-449 37 pin
RS-336 25 pin
D-type
D-type
connector
connector
P1
P2
P3
P4
P5
P6
4-41